WTW SenTix 41 pH Electrode with Temperature Sensor, Gel Electrolyte, DIN Connector, 103635
€230.00
% Manufacturer's RRP: €255.00 9% below manufacturer's RRP
- Plastic shaft, 120 mm long, 12 mm in diameter
- Gel electrolyte, low-maintenance, non-refillable
- Fibre junction, prevents blockages according to WTW
- Measuring range 0 to 14 pH, 0 to 80 °C
- Membrane resistance less than 1 GΩ at 25 °C
- 1 m fixed cable, DIN plug and banana plug
- With 30 kΩ NTC temperature sensor
Product information "WTW SenTix 41 pH Electrode with Temperature Sensor, Gel Electrolyte, DIN Connector, 103635"
Measuring pH in wastewater, aquariums or swimming pools should not depend on a refilling routine. The WTW SenTix 41 features a plastic shaft and a gel electrolyte which, according to WTW, is not refilled. The electrode is low-maintenance. The pH measuring range extends from 0 to 14, and it can be used at sample temperatures of 0 to 80 °C.
Gel electrolyte and fibre junction
The shaft is made of PPE/PS, is 120 mm long and has a diameter of 12 mm. The membrane is cylindrical; its resistance at 25 °C is less than 1 GΩ. According to WTW, the fibre junction prevents blockages. There is no need to monitor or top up the electrolyte level. If the electrolyte is meant to be refillable, the SenTix 51 and 52 with liquid electrolyte and a ceramic junction in a plastic shaft are the alternative.
Connection and temperature measurement
The SenTix 41 has a permanently attached 1 m cable with a waterproof DIN plug (DIN 19262). An NTC temperature sensor (30 kΩ) is built in and measures the sample temperature; it is connected to the 4 mm banana plug. The gel electrodes in this range differ in plug, cable length and temperature sensor. You should therefore establish which input the measuring instrument has before placing your order.
Typical applications according to WTW
When taking samples from water bodies, at the edge of a pool or from a wastewater pipe, what counts is an electrode that is quickly ready for use. WTW names the following media for this series:
- Electroplating effluent, industrial wastewater and wastewater in general
- Aquarium and swimming pool water
- Groundwater, lake water, surface water and seawater
- Household cleaners
Storage and care
Before the first measurement, remove the wetting cap; gas bubbles behind the membrane can be removed by shaking. For short measurement breaks, immerse the electrode in reference electrolyte (3 mol/l KCl, Ag+-free). Overnight and for longer periods, it stays in the wetting cap, filled with the same electrolyte. According to WTW, storing the electrode dry or in deionised water can cause permanent damage. If the cap has dried out, the electrode needs at least 24 hours in reference electrolyte. As with any pH electrode, strong acids and alkalis, hydrofluoric acid, organic solvents, oils, fats and proteins shorten its service life.
Technical details
| Type | pH electrode, analogue, gel electrolyte |
| Shaft material | Plastic (PPE/PS) |
| Shaft length / Shaft diameter | 120 mm / 12 mm |
| Electrolyte | Gel, non-refillable |
| Reference system | Silver/silver chloride |
| Junction | Fibre |
| Membrane shape | Cylindrical |
| pH measuring range | 0 to 14 |
| Temperature range | 0 to 80 °C |
| Membrane resistance | < 1 GΩ at 25 °C |
| Temperature sensor | NTC 30 kΩ |
| Connection | DIN plug (DIN 19262), waterproof, and 4 mm banana plug |
| Cable | 1 m fixed cable |
Scope of delivery
- 1 WTW SenTix 41 pH electrode with wetting cap
- 1 m fixed cable with DIN and banana plugs, permanently attached to the electrode
Accessories and procurement service
Reference electrolyte KCl 3 mol/l for the wetting cap and buffer solutions for calibration are also available. Enquiries regarding other SenTix models or larger quantities go through our procurement service.